{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "A series of novel 2 - ferrocenyl - 7 - hydroxy - 5 - phenethyl - 5 , 6 , 7 , 8 - tetrahydro - 4H - pyrazolo [ 1 , 5 - a ] [ 1 , 4 ] diazepin - 4 - one derivatives with optical activity ( 2 ) was synthesized in the microwave - assisted condition and characterized by means of IR , ( 1 ) H NMR and mass spectroscopy , and furthermore confirmed by X - ray analysis of a representative compound ( R ) - 2a ."}
{"Chemical": ["2 - ferrocenyl - 7 - hydroxy - 5 - phenethyl - 5 , 6 , 7 , 8 - tetrahydro - 4H - pyrazolo [ 1 , 5 - a ] [ 1 , 4 ] diazepin - 4 - one", "( 1 ) H"]}